135 lines
3.9 KiB
PHP
135 lines
3.9 KiB
PHP
<?php
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/**
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* These helpful functions were lifted from the Symfony library
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* https://github.com/symfony/http-foundation/blob/master/LICENSE
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*
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* Http utility functions.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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namespace SilverStripe\Control\Util;
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/**
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* Http utility functions.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class IPUtils
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{
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/**
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* This class should not be instantiated.
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*/
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private function __construct()
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{
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}
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/**
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* Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
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*
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* @param string $requestIP IP to check
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* @param string|array $ips List of IPs or subnets (can be a string if only a single one)
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*
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* @return bool Whether the IP is valid
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*
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* @package framework
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* @subpackage core
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*/
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public static function checkIP($requestIP, $ips)
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{
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if (!is_array($ips)) {
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$ips = [$ips];
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}
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$method = substr_count($requestIP, ':') > 1 ? 'checkIP6' : 'checkIP4';
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foreach ($ips as $ip) {
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if (self::$method($requestIP, trim($ip))) {
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return true;
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}
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}
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return false;
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}
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/**
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* Compares two IPv4 addresses.
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* In case a subnet is given, it checks if it contains the request IP.
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*
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* @param string $requestIP IPv4 address to check
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* @param string $ip IPv4 address or subnet in CIDR notation
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*
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* @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet
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*/
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public static function checkIP4($requestIP, $ip)
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{
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if (!filter_var($requestIP, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
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return false;
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}
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if (false !== strpos($ip, '/')) {
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list($address, $netmask) = explode('/', $ip, 2);
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if ($netmask === '0') {
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return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
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}
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if ($netmask < 0 || $netmask > 32) {
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return false;
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}
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} else {
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$address = $ip;
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$netmask = 32;
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}
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return 0 === substr_compare(sprintf('%032b', ip2long($requestIP)), sprintf('%032b', ip2long($address)), 0, $netmask);
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}
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/**
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* Compares two IPv6 addresses.
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* In case a subnet is given, it checks if it contains the request IP.
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*
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* @author David Soria Parra <dsp@php.net>
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*
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* @see https://github.com/dsp/v6tools
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*
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* @param string $requestIP IPv6 address to check
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* @param string $ip IPv6 address or subnet in CIDR notation
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*
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* @return bool Whether the IP is valid
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*
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* @throws \RuntimeException When IPV6 support is not enabled
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*/
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public static function checkIP6($requestIP, $ip)
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{
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if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) {
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throw new \RuntimeException('Unable to check IPv6. Check that PHP was not compiled with option "disable-ipv6".');
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}
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if (false !== strpos($ip, '/')) {
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list($address, $netmask) = explode('/', $ip, 2);
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if ($netmask < 1 || $netmask > 128) {
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return false;
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}
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} else {
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$address = $ip;
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$netmask = 128;
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}
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$bytesAddr = unpack('n*', @inet_pton($address));
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$bytesTest = unpack('n*', @inet_pton($requestIP));
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if (!$bytesAddr || !$bytesTest) {
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return false;
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}
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for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
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$left = $netmask - 16 * ($i - 1);
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$left = ($left <= 16) ? $left : 16;
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$mask = ~(0xffff >> $left) & 0xffff;
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if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
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return false;
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}
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}
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return true;
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}
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}
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